package com.zh.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * @Description:
 * @ClassName TestNettyServerHandler
 * @date: 2021.02.11 16:48
 * @Author: zhanghang
 */
/**
 * 说明：
 * 1. SimpleChannelInboundHandler 就是ChannelInboundHandler 的子类
 * HttpOnject 表示的是 客户端和服务器端相互通讯的数据被封装成 HttpObject
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
    // channelRead0 读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        // 判断msg 是不是一个 HttpRequest 请求
        if (msg instanceof HttpRequest){
            System.out.println("msg 类型=" + msg.getClass());
            System.out.println("客户端地址="+ctx.channel().remoteAddress());

            // msg 就是客户端发送的消息，强转为HttpRequest
            HttpRequest httpRequest = (HttpRequest) msg;
            // 获取uri,过滤特定资源
            URI uri = new URI(httpRequest.uri());
            if ("/favicon.ico".equals(uri.getPath())){
                System.out.println("你请求了/favicon.ico资源， 不做响应");
                return;
            }

            // 回复信息给浏览器[http协议]
            ByteBuf content = Unpooled.copiedBuffer("hello,我是服务器", CharsetUtil.UTF_8);

            // 构造一个http的响应， 即HttpRespose
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK,content);

            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain;charset=utf-8");
            // 设置长度
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());

            // 将构建好的response 返回
            ctx.writeAndFlush(response);
        }
    }
}
